I want to compute a latent class analysis with nominal indicators (example 7.7 in the user's guide). I expected that for the values of the indicators conditional probabilities would be provided. Instead in the result section means are reported. How can a nominal variable have a mean? What mistake do I make? Does Mplus not make the same analysis like Latent Gold for example?

The estimated item parameters that are reported are logits for the different categories of each nominal indicator. These logits can be translated into probabilities very easily using the multinomial logistic regression expression - this is discussed in Chapter 13 of the User's Guide.